As soon as the function is set up in the app, when logging in to a Google service via Chrome on another device, e.g. B. a laptop, a push notification sent to the iOS device.
The user must then unlock their "iPhone" or "iPad" with the face ID or the touch ID and confirm the login attempt via the Smart Lock app before it can be executed on the other device.
After installing the update, users are asked to select a Google account to set up their phone's built-in security key. According to a Google cryptographer the feature uses Apple's Secure Enclave hardware that securely stores "Touch ID", Face ID and other cryptographic data on iOS devices.
The Smart Lock app requires Bluetooth to be enabled on both the iPhone / iPad and the other device for two-factor authentication to work. So you must be in the immediate vicinity. Process is localized and cannot access the Internet.
The Google Smart Lock app is a free download for "iPhone" and "iPad" from the App Store. [Direct Link]